Web Reference: Nov 27, 2025 · A HashMap is a part of Java’s Collection Framework and implements the Map interface. It stores elements in key-value pairs, where, Keys are unique. and Values can be duplicated. Internally uses Hashing, hence allows efficient key-based retrieval, insertion, and removal with an average of O (1) time. It is part of the java.util package and implements the Map interface. Instead of accessing elements by an index (like with ArrayList), you use a key to retrieve its associated value. Aug 9, 2024 · What is a HashMap in Java? A HashMap implements the Map interface, which is part of the Java collection framework. It's based on the concept of Hashing. Hashing is a technique that transforms an input of arbitrary size into a fixed-size output using a hash function.
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